rydsno Posted August 23, 2009 Share Posted August 23, 2009 Wondering if anyone has ever had any surging/pulsing motor issues. I only seem to notice it when under load like uphill, 2800-3200 rpw, feels like a slight surging from the motor. I just replaced the spark plugs and fuel filter, cleaned the air filter(K&N) and still has the surging. I also found one cracked vac line and fixed that. It is very slight, but annoying none the less. Fuel pump getting weak maybe? Timing? Any ideas? Link to comment Share on other sites More sharing options...
adamzan Posted August 23, 2009 Share Posted August 23, 2009 Mine did that, and it was the o2 sensor. Link to comment Share on other sites More sharing options...
rydsno Posted August 23, 2009 Author Share Posted August 23, 2009 You didn't get a CEL or anything? Link to comment Share on other sites More sharing options...
94extreme Posted August 23, 2009 Share Posted August 23, 2009 you won't always get the cel with 02 or other sensors.. that happens sometimes. it still could be another vacuum leak.. are the gaps right? wires crossing? how does the truck accelerate and decelerate while stopped in P or N? if it's smooth, it's probably not the timing.. could be maf. especially the plug.. it could be other stuff.. you'll just have start eliminating possibilites until you find the issue. Link to comment Share on other sites More sharing options...
Balmer Posted August 24, 2009 Share Posted August 24, 2009 Curious thread. My 'Finder surges/pulses between 750- 950 rpm at idle once it's warmed up. I wonder if the issue could be the same despite happening at different engine speeds? Link to comment Share on other sites More sharing options...
Simon Posted August 24, 2009 Share Posted August 24, 2009 Balmer, yours sounds like the MAF. Have you cleaned it, and the connector lately? Link to comment Share on other sites More sharing options...
87pathy Posted August 24, 2009 Share Posted August 24, 2009 for balmer, I bet his is the AIV.. mine does the same, and that is the problem according to my local "expert" and it won't pass air cair either because of it. Link to comment Share on other sites More sharing options...
rydsno Posted August 24, 2009 Author Share Posted August 24, 2009 Well, I just cleaned my MAF sensor, thanks to( http://www.nissanpathfinders.net/forum/index.php?showtopic=5194 ), but I haven't taken it out yet. Started up nice and fast though. I'll see what happens when I go for a drive. Link to comment Share on other sites More sharing options...
Precise1 Posted August 24, 2009 Share Posted August 24, 2009 There was a thread a while back specifically about surging/stumbling uphill on the freeway a while back. If your efforts didn't fix it, I'll try to find it... PS Make sure to display the year of your rig, not just XE... B Link to comment Share on other sites More sharing options...
rydsno Posted August 25, 2009 Author Share Posted August 25, 2009 (edited) OK fixed the year thing, didn't realize i missed it. Anyways, MAF cleaning didn't seem to change anything. Should I be looking at the O2 sensor? Can you clean an O2 sensor? I also thought of maybe running a fuel injector cleaner through it. Anyone think injector cleaners are worth it? Oh, and the surging is very slight, not very noticeable. Edited August 25, 2009 by rydsno Link to comment Share on other sites More sharing options...
Mookie Posted August 25, 2009 Share Posted August 25, 2009 OK fixed the year thing, didn't realize i missed it. Anyways, MAF cleaning didn't seem to change anything. Should I be looking at the O2 sensor? Can you clean an O2 sensor? I also thought of maybe running a fuel injector cleaner through it. Anyone think injector cleaners are worth it? Oh, and the surging is very slight, not very noticeable. It does sound like the 02 sensor. Surging or misfire under load, against headwinds, especially after the engine is up to temp. I don't think you can clean them, but you can test the voltage I believe. I think...someone might chime in about this. Link to comment Share on other sites More sharing options...
nunya Posted August 25, 2009 Share Posted August 25, 2009 http://npora.ipbhost.com//index.php?showto...39&hl=surge Think this is the one your thinking of B, gave me something to do. See if it helps you out at all rydsno. Link to comment Share on other sites More sharing options...
Precise1 Posted August 25, 2009 Share Posted August 25, 2009 No, it isn't Nunya, but it is wholely applicable so thanks for that! The one I'm thinking is a bit older, kinda like me. I'm about to go to sleep so maybe tomorrow... B Link to comment Share on other sites More sharing options...
adamzan Posted August 25, 2009 Share Posted August 25, 2009 Unplug the o2 sensor and if it runs better the sensor is bad. (it will use default settings in the computer with it unplugged) Link to comment Share on other sites More sharing options...
rydsno Posted August 26, 2009 Author Share Posted August 26, 2009 Won't unplugging the O2 give a CEL? Link to comment Share on other sites More sharing options...
adamzan Posted August 26, 2009 Share Posted August 26, 2009 Didn't on mine. Though I only left it unplugged long enough to take on the highway and back home to test it out. So It might not have been unplugged long enough. Link to comment Share on other sites More sharing options...
Precise1 Posted August 26, 2009 Share Posted August 26, 2009 Won't unplugging the O2 give a CEL? A bad O2 doesn't always trigger the CEL. Just the way it is... B Link to comment Share on other sites More sharing options...
Balmer Posted August 26, 2009 Share Posted August 26, 2009 for balmer, I bet his is the AIV..mine does the same, and that is the problem according to my local "expert" and it won't pass air cair either because of it. That's the Air...something Valve right? I heard someone mention something like it a long time ago and they said it was a huge PITA to swap... or it was really pricey??? There was some roadblock to fixing the issue. '87Pathy, what has stopped you from doing the repair to your rig? Link to comment Share on other sites More sharing options...
87pathy Posted August 26, 2009 Share Posted August 26, 2009 AIV (air injection Valve) this adds air during idle to lower your CO emissions, (makes it run leaner) AIV solenoid 60 bucks AIV switch 60 bucks AIV box.. no longer available. unless you go to a junk yard. and they aren't any better. Link to comment Share on other sites More sharing options...
Balmer Posted August 26, 2009 Share Posted August 26, 2009 So what do you think the issue is? the valve itself, the solenoid or the box? Is there an inherant problem with the box - I'm assuming so since you say the JY ones are no better? Do you think that there's a way to repair it with a modded part or completely by-pass it. I'm thinking that the surging itself may be caused by the valve fluctuating between open and closed or partially open to partially closed. If this is the case could the valve not be permanently closed to prevent the condition by allowing the engine to run a bit rich at Idle? Link to comment Share on other sites More sharing options...
87pathy Posted August 26, 2009 Share Posted August 26, 2009 not sure dude, all 3 of mine were / are bad. maybe take it to somebody that can put a real machine on it and not just run the codes. Link to comment Share on other sites More sharing options...
Balmer Posted August 26, 2009 Share Posted August 26, 2009 not sure dude, all 3 of mine were / are bad. maybe take it to somebody that can put a real machine on it and not just run the codes. Ya, maybe one day...'til then I'll just live with it. There's no emissions testing in Hope so I'm lucky in that regard. Link to comment Share on other sites More sharing options...
87pathy Posted August 26, 2009 Share Posted August 26, 2009 if you don't have air care, get rid of ALL that crap. Link to comment Share on other sites More sharing options...
Balmer Posted August 26, 2009 Share Posted August 26, 2009 I can do that without adverse effects? Is it easy to figure out what's what? Link to comment Share on other sites More sharing options...
87pathy Posted August 26, 2009 Share Posted August 26, 2009 ya, its pretty easy to figure out. basically pull every vacume line and canister off on the engine (expet for a couple necessary ones. by by charcol canister, by by egr, by by aiv bull@!*%.. Link to comment Share on other sites More sharing options...
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